Готові списки джерел за темами / Hyperbolic metamaterial

Добірка наукової літератури з теми "Hyperbolic metamaterial"

Автор: Grafiati
Опубліковано: 6 вересня 2023
Оновлено: 10 серпня 2024

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Статті в журналах з теми "Hyperbolic metamaterial"

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Tonkaev, Pavel, and Sergey Makarov. "Control of spontaneous emission rate in lead halide perovskite film on hyperbolic metamaterial." Journal of Physics: Conference Series 2015, no. 1 (November 1, 2021): 012153. http://dx.doi.org/10.1088/1742-6596/2015/1/012153.

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Анотація:
Abstract Hyperbolic metamaterials represent a class of nanophotonic architectures with the possibility of controlling density of optical states. Due to this property, hyperbolic metamaterials can be employed as meta-electrodes in optoelectronic devices. On the other hand, lead halide perovskites have several promising properties for application in light-emitting devices. Moreover, a perovskite film is easily deposited on a hyperbolic metamaterial surface. Here, we theoretically show how to accelerate radiative recombination in a perovskite film with a hyperbolic metamaterial. This effect can be applied in light-emitting devices, where radiative recombination is extremely important.
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2

Newman, Ward D. "Infrared non-invasive sub-wavelength microscopy with metamaterials." Eureka 3, no. 1 (March 26, 2012): 11–18. http://dx.doi.org/10.29173/eureka10334.

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Анотація:
I demonstrate that hyperbolic metamaterials may provide the solution to the long-standing prob- lem of the fundamental diffraction limit plaguing conventional microscopy and optical imaging sys- tems. Presented here is the formalism of the theory, classical electrodynamics, used to describe the diffraction limit and sub-wavelength imaging using hyperbolic metamaterials. Effective medium theory is then derived and put forth as a design method for such hyperbolic metamaterials. I then outline the design of a planar device based on a hyperbolic metamaterial for use in infrared mi- croscopy, and present numerical simulations to demonstrate the behaviour and performance of the device. The device employs multilayers of InGaAs/AlInAs and is capable of sub-diffraction imaging resolution in the wavelength range of 8.8 - 10.5 μm. I show that high spatial frequency waves, which normally decay in vacuum, are allowed to propagate and reach the far-field in a hyperbolic meta- material. Using a Green’s function formalism to describe optical sources, sub-wavelength imaging capabilities of hyperbolic metamaterials is shown. Finally, potential device applications using the designed metamaterial are motivated.
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3

Smolyaninov, Igor I., and Vera N. Smolyaninova. "Analogue Quantum Gravity in Hyperbolic Metamaterials." Universe 8, no. 4 (April 14, 2022): 242. http://dx.doi.org/10.3390/universe8040242.

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Анотація:
It is well known that extraordinary photons in hyperbolic metamaterials may be described as living in an effective Minkowski spacetime, which is defined by the peculiar form of the strongly anisotropic dielectric tensor in these metamaterials. Here, we demonstrate that within the scope of this approximation, the sound waves in hyperbolic metamaterials look similar to gravitational waves, and therefore the quantized sound waves (phonons) look similar to gravitons. Such an analogue model of quantum gravity looks especially interesting near the phase transitions in hyperbolic metamaterials where it becomes possible to switch quantum gravity effects on and off as a function of metamaterial temperature. We also predict strong enhancement of sonoluminescence in ferrofluid-based hyperbolic metamaterials, which looks analogous to particle creation in strong gravitational fields.
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4

Smolyaninov, Igor I., and Vera N. Smolyaninova. "Metamaterial superconductors." Nanophotonics 7, no. 5 (May 24, 2018): 795–818. http://dx.doi.org/10.1515/nanoph-2017-0115.

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Анотація:
AbstractSearching for natural materials exhibiting larger electron-electron interactions constitutes a traditional approach to high-temperature superconductivity research. Very recently, we pointed out that the newly developed field of electromagnetic metamaterials deals with the somewhat related task of dielectric response engineering on a sub-100-nm scale. Considerable enhancement of the electron-electron interaction may be expected in such metamaterial scenarios as in epsilon near-zero (ENZ) and hyperbolic metamaterials. In both cases, dielectric function may become small and negative in substantial portions of the relevant four-momentum space, leading to enhancement of the electron pairing interaction. This approach has been verified in experiments with aluminum-based metamaterials. Metamaterial superconductor with Tc=3.9 K have been fabricated, which is three times that of pure aluminum (Tc=1.2 K), which opens up new possibilities to improve the Tc of other simple superconductors considerably. Taking advantage of the demonstrated success of this approach, the critical temperature of hypothetical niobium, MgB2- and H2S-based metamaterial superconductors is evaluated. The MgB2-based metamaterial superconductors are projected to reach the liquid nitrogen temperature range. In the case of an H2S-based metamaterial, the projected Tc appears to reach ~250 K.
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5

Kurilkina, S., V. Belyi, and N. Kazak. "Surface Plasmon-Polaritons at the Interface of Magnetoelectric Hyperbolic Metamaterial." Nonlinear Phenomena in Complex Systems 23, no. 3 (October 28, 2020): 327–31. http://dx.doi.org/10.33581/1561-4085-2020-23-3-327-331.

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In this paper, we investigated the features of plasmon-polaritons excited at the interface of a magnetoelectric hyperbolic metamaterial and a dielectric for the case when the optical axis is arbitrary oriented under the normal to the boundary. Expressions are obtained for the complex electric and magnetic vectors as well as for the decay constants of the fields on both sides of the interface. The possibility is shown and the conditions are determined for localization of plasmon-polariton at the boundary of metamaterial of different types. It is shown that the wave vector of plasmon-polariton has the component oriented perpendicular to the boundary. It is established that for metamaterials of different types changing the orientation of the optical axis one can realize the conditions when the phase velocity of plasmon-polariton is directed from the boundary inside a metamaterial or a dielectric.
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6

Belyi, V., S. Kurilkina, N. Kazak, and V. Agabekov. "Surface Plasmon-Polaritons and Transverse Spin Angular Momentum at the Boundary of Hyperbolic Metamaterial with Arbitrary Orientation of the Optical Axis." Advanced Electromagnetics 6, no. 3 (October 20, 2017): 70. http://dx.doi.org/10.7716/aem.v6i3.587.

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Анотація:
The possibility is established and the conditions are found for localization of plasmon-polaritons (PPs) near the boundaries of hyperbolic metamaterials (HMs) of both I and II types with arbitrary orientation of the optical axis. It is grounded that such surface PP has the transverse spin momentum which depends on the wavelength of the exciting wave, the orientation of the optical axis of the hyperbolic metamaterial, and dielectric properties of bordered media.
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7

He, Qingguo, Yuliang Hou, Xiaomeng Li, Shuang Li, and Liang Meng. "Investigation on the Compressive Behavior of Hybrid Polyurethane(PU)-Foam-Filled Hyperbolic Chiral Lattice Metamaterial." Polymers 15, no. 9 (April 25, 2023): 2030. http://dx.doi.org/10.3390/polym15092030.

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In this study, a novel hybrid metamaterial has been developed via fulfilling hyperbolic chiral lattice with polyurethane (PU) foam. Initially, both the hyperbolic and typical body-centered cubic (BCC) lattices are fabricated by 3D printing technique. These lattices are infiltrated in a thermoplastic polyurethane (TPU) solution dissolved in 1,4-Dioxane, and then freeze casting technique is applied to achieve the PU-foam-filling. Intermediate (IM) layers possessing irregular pores, are formed neighboring to the lattice-foam interface. While, the foam far from the lattice exhibits a multi-layered structure. The mechanical behavior of the hybrid lattice metamaterials has been investigated by monotonic and cyclic compressive tests. The experimental monotonic tests indicate that, the filling foam is able to soften the BCC lattice but to stiffen the hyperbolic one, further to raise the stress plateau and to accelerate the densification for both lattices. The foam hybridization also benefits the hyperbolic lattice to prohibit the property degradation under the cyclic compression. Furthermore, the failure modes of the hybrid hyperbolic lattice are identified as the interface splitting and foam collapse via microscopic analysis. Finally, a parametric study has been performed to reveal the effects of different parameters on the compressive properties of the hybrid hyperbolic lattice metamaterial.
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8

Davidovich M. V. "Plane wave diffraction on a layer of asymmetric hyperbolic metamaterial." Technical Physics Letters 49, no. 1 (2023): 7. http://dx.doi.org/10.21883/tpl.2023.01.55337.19196.

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Анотація:
We consider the diffraction of a plane wave on a layer of symmetric hyperbolic metamaterial made of metal and SiO2 layers. It is shown that the reflection coefficient depends not only on the angle of incidence, but also on the direction of incidence relative to the anisotropy axis. In an arbitrary fall, a plate of an asymmetric hyperbolic metamaterial creates scattered waves of both polarizations. Keywords: hyperbolic metamaterial, diffraction, effective permittivity tensor, homogenization.
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9

Guo, Yu, Ward Newman, Cristian L. Cortes, and Zubin Jacob. "Applications of Hyperbolic Metamaterial Substrates." Advances in OptoElectronics 2012 (December 6, 2012): 1–9. http://dx.doi.org/10.1155/2012/452502.

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Анотація:
We review the properties of hyperbolic metamaterials and show that they are promising candidates as substrates for nanoimaging, nanosensing, fluorescence engineering, and controlling thermal emission. Hyperbolic metamaterials can support unique bulk modes, tunable surface plasmon polaritons, and surface hyperbolic states (Dyakonov plasmons) that can be used for a variety of applications. We compare the effective medium predictions with practical realizations of hyperbolic metamaterials to show their potential for radiative decay engineering, bioimaging, subsurface sensing, metaplasmonics, and super-Planckian thermal emission.
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10

Yao, Jie, Yuan Wang, Kun-Tong Tsai, Zhaowei Liu, Xiaobo Yin, Guy Bartal, Angelica M. Stacy, Yuh-Lin Wang, and Xiang Zhang. "Design, fabrication and characterization of indefinite metamaterials of nanowires." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1950 (September 13, 2011): 3434–46. http://dx.doi.org/10.1098/rsta.2011.0159.

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Анотація:
Indefinite optical properties, which are typically characterized by hyperbolic dispersion relations, have not been observed in naturally occurring materials, but can be realized through a metamaterial approach. We present here the design, fabrication and characterization of nanowire metamaterials with indefinite permittivity, in which all-angle negative refraction of light is observed. The bottom-up fabrication technique, which applies electrochemical plating of nanowires in porous alumina template, is developed and demonstrated in achieving uniform hyperbolic optical properties at a large scale. We developed techniques to improve the uniformity and to reduce the defect density in the sample. The non-magnetic design and the off-resonance operation of the nanowire metamaterials significantly reduce the energy loss of electromagnetic waves and make the broad-band negative refraction of light possible.
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Більше джерел

Дисертації з теми "Hyperbolic metamaterial"

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Wang, Xuan. "Fabrication, structural and optical study of self-assembled hyperbolic metamaterial." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0694/document.

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Анотація:
Des propriétés optiques inédites sont prédites si des nanorésonateurs optiques sont organisés dans un matériau, ce qui peut être réalisé par l’auto-assemblage de nanoparticules plasmoniques synthétisées chimiquement. Dans ce travail de doctorat, nous utilisons des structures ordonnées de copolymères à blocs pour organiser des nanoparticules plasmoniques. Nous étudions le lien entre la structure des nanocomposites en films minces, et en particulier la nature, la densité et l’organisation des nanoparticules, et leurs propriétés optiques. Pour cela, nous avons tout d’abord produit des phases lamellaires de copolymères diblocs poly(styrène)-block-poly(2-vinylpyridine) (PS-b-P2VP) en films minces d’épaisseur (100nm-700nm) et de période lamellaire (17nm-70nm) contrôlées, et dont l’alignement et l’homogénéité sont optimisés. Nous avons développé une synthèse in situ, au sein de ces films lamellaires, qui permet de produire de façon contrôlée et reproductible, des nanoparticules plasmoniques de diamètre 7-10nm sélectivement dans les domaines P2VP. Nous avons montré que la taille et la forme des particules d’or formées in situ peuvent être modifiées en jouant sur le solvant et le réducteur chimique mis en jeu. Nous avons étudié en détail la structure des nanocomposites formulés, ce qui est en particulier nécessaire à la bonne exploitation des données d’ellipsométrie spectroscopique afin de déterminer les réponses optiques. La structure des échantillons a été étudiée par différentes méthodes de microscopie (électronique en transmission ou à balayage, à force atomique), ainsi que de la diffusion des rayons X. Nous avons utilisé une microbalance à Quartz pour étudier la quantité d’or introduite dans les matrices lamellaires de manière « cinétique » au fil de son augmentation progressive. La quantité d’or atteint des valeurs de 40 % en volume. Les propriétés optiques des films nanocomposites sont déterminées par ellipsométrie spectroscopique à angle variable et analysées à l’aide de modèles de milieux effectifs. Les films sont homogènes et anisotropes uniaxes, et on peut définir leur tenseur de permittivité diélectrique avec une composante ordinaire εo (parallèle au substrat) et une composante extraordinaire εe (perpendiculaire au substrat). L’analyse permet de montrer que les deux composantes εo and εe présentent une résonance proche de la longueur d’onde =540nm, avec une amplitude très supérieure pour εo. Lorsque la quantité d’or dans la structure lamellaire est suffisante, εo devient négatif au voisinage de la résonance et le matériau atteint le régime appelé hyperbolique, ce qui constitue un jalon essentiel pour le développement de matériaux pour des applications en imagerie hyper-résolue
Novel optical properties in the visible range are foreseen when organizing nanoresonators, which can be performed by the self-assembly of plasmonic nanoparticles prepared by wet chemistry. In this project, we use templating block copolymers structures to organize plasmonic particles. Our goal is to relate the structure of the prepared nanocomposites thin films, and in particular the nature, density and spatial organization of the nanoparticles, with their optical index.For this purpose, we first fabricate lamellar superlattices of diblock copolymers (poly(styrene)-block-poly(2-vinylpyridine) of controlled thickness (100nm-700nm), controlled lamellar period size(17 nm-70 nm) and optimized alignment and homogeneity. Following the fabrication of the multilayer templates, an in situ and reproducible synthesis of metallic nanoparticles was developed in order to generate nanocomposites selectively inside the P2VP layers. The size of Au nanoparticles can be well controlled around 7-10 nm. We also found that the reduction process could influence the shape (sphere, triangle or cylinder) and size by using different solvents or reducing agents. Because the extraction of accurate optical responses from the spectroscopic ellipsometry data, which will come in the last part, critically relies on the precise knowledge of the sample structure. We have used several experimental techniques to access a precise description of the produced materials. In particular, we used a Quartz Crystal Microbalance as a measurement tool to ‘kinetically’ study the volume fraction of Au loading. We find that the amount of gold in the composite layers can be varied up to typically 40 volume%. The optical properties of the nanocomposite films are determined by variable angle spectroscopic ellipsometry and analyzed by appropriately developed effective medium models. The films are structurally uniaxial and homogeneous, and we can define their dielectric permittivity tensor with the ordinary (parallel to the substrate) and extraordinary (normal to the substrate) components. The analysis of the lamellar structures allows the extraction of the components εo and εe, both presenting a resonance close to =540nm, with a significantly stronger amplitude for εo. When the gold load is high enough and the couplings between particles are strong enough, the values of εo become negative close to the resonance, and the material reaches the so-called hyperbolic regime, which constitutes a step towards applications in hyper-resolution imaging
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2

Habib, Md Samiul. "Sub-diffraction Imaging with Wire Array Metamaterial Fibres: Novel Geometrics and Migration of Artefacts." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18702.

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Анотація:
Hyperbolic metamaterials, due to their extraordinary optical properties, have gained much attention in the scientific community, in particular for imaging to create sub-wavelength imaging devices. A special class of hyperbolic metamaterials are the wire media (WM), comprised of a sub-wavelength array of metal wires. From radio to terahertz (THz) frequencies, WM possess a nearly flat dispersion relation that allows them to support high spatial frequency propagating waves, and can be used to beat the diffraction limit. With WM, two practical imaging devices have been demonstrated at microwave and THz frequencies: endoscope (straight WM) and hyperlens. However, their performance is highly dependent on frequency, and at some frequencies is limited by the unwanted imaging artefacts, and thus require effective methods to correct them. Moreover, most previous designs of magnifying hyperlenses rely on either curved or tapered geometry, making fabrication difficult, especially in large volumes. In this thesis, we numerically study these unwanted artefacts, and introduce post-processing methods to remove them, so that the WM can be used as a broad-band imaging device. In addition, for the first time we fabricate a magnifying WM prism hyperlens at THz frequencies that does not rely on the tapering process, making fabrication easier. We experimentally characterize the transmission properties of the prism hyperlens using THz time-domain spectroscopy that allows us to resolve sub-wavelength information with a two-fold magnified image. Finally, on the basis of analytical approaches, we study the far-field propagation with the prism hyperlens, and also discuss when reconstruction of sub-wavelength objects in the far-field is possible.
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3

Fullager, Daniel B. "Theory, Characterization and Applications of Infrared Hyperbolic Metamaterials." Thesis, The University of North Carolina at Charlotte, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10267303.

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Hyperbolic Metamaterials (HMMs) are engineered structures capable of supporting lightmatter interactions that are not normally observed in naturally occuring material systems. These unusual responses are enabled by an enhancement of the photonic density of states (PDOS) in the material. The PDOS enhancement is a result of deliberately introduced anisotropy via a permittivity sign-change in HMM structures which increases the number and frequency spread of possible wave vectors that propagate in the material. Subwavelength structural features allow effective medium theories to be invoked to construct the k-space isofrequency quadratic curves that, for HMMs, result in the k-space isofrequency contour transitioning from being a bounded surface to an unbounded one. Since the PDOS is the integral of the differential volume between k-space contours, unbounded manifolds lead to the implication of an infinite or otherwise drastically enhanced PDOS. Since stored heat can be thought of as a set of non-radiative electromagnetic modes, in this dissertation we demonstrate that HMMs provide an ideal platform to attempt to modify the thermal/IR emissivity of a material. We also show that HMMs provide a platform for broadband plasmonic sensing. The advent of commercial two photon polymerization tools has enabled the rapid production of nano- and microstructures which can be used as scaffolds for directive infrared scatterers. We describe how such directive components can be used to address thermal management needs in vacuum environments in order to maximize radiative thermal transfer. In this context, the fundamental limitations of enhanced spon- taneous emission due to conjugate impedance matched scatterers are also explored. The HMM/conjugate scatterer system’s performance is strongly correlated with the dielectric function of the negative permittivity component of the HMM. In order to fully understand the significance of these engineered materials, we examine in detail the electromagnetic response of one ternary material system, aluminium-doped zinc oxide (AZO), whose tuneable plasma frequency makes it ideal for HMM and thermal transfer applications. This study draws upon first principle calculations from the open literature utilizing a Hubbard-U corrected model for the non-local interaction of charge carriers in AZO crystalline systems. We present the first complete dielectric function of industrially produced AZO samples from DC to 30,000 cm –1 and conclude with an assessment of this material’s suitability fo the applications described.

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4

Chen, Hongwei. "Directional Emission of Light in Hyperbolic Metamaterials and Its Application in Miniature Polarimeter." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1565630730775184.

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5

Brownless, John Scott. "Strips, Slabs, and Stacks: The Guided Modes of Conventional and Novel Wire Media Devices." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16522.

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Анотація:
Wire media (WM) are hyperbolic metamaterials consisting of subwavelength arrays of metal wires. Their hyperbolic dispersion properties allow them to support modes with highly subwavelength variations, which have been used to create subwavelength imaging devices. These devices have had great early success, with the two primary realizations, the WM metamaterial hyperlens and the resonant metalens, being experimentally demonstrated at terahertz and microwave frequencies respectively. However at terahertz frequencies and above, undesirable effects begin to limit the performance of these devices, and we require new techniques to maintain the viability of these devices. In this thesis, we study these subwavelength modes in both conventional and novel WM structures, using a strategy which combines the physical intuition gained from analytical treatments with the accuracy of fully numerical models. This strategy is implemented to test the limitations of approximations used in deriving analytical models of WM slabs, and the regimes in which effective medium treatments are valid. We use these models to understand the behavior found in novel WM geometries, and propose ways of utilizing these geometries to improve the performance of WM subwavelength imaging devices. While performing this analysis we also uncover interesting behavior unrelated to subwavelength imaging, and suggest alternative applications and research for these novel WM devices. In addition to our theoretical work, we also fabricated a 1D WM resonant metalens and performed an experiment to characterize this lens at terahertz frequencies. This experiment provides a greater understanding of the practical issues confronted at these frequencies, and presents an opportunity to connect our theoretical work with real life measurements. We use the insights gained through this thesis to create a strategy for optimising the performance of this lens, and propose a design with an improved response at terahertz frequencies.
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6

Ring, Josh. "Novel fabrication and testing of light confinement devices." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/novel-fabrication-and-testing-of-light-confinement-devices(51572720-0c49-482e-8523-e44ca877117f).html.

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The goal of this project is to study novel nanoscale excitation volumes, sensitive enoughto study individual chromophores and go on to study new and exciting self assemblyapproaches to this problem. Small excitation volumes may be engineered using light con-finement inside apertures in metal films. These apertures enhance fluorescence emissionrates, quantum yields, decrease fluorescence quenching, enable higher signal-to-noiseratios and allow higher concentration single chromophore fluorescence, to be studied byrestricting this excitation volume. Excitation volumes are reported on using the chro-mophore's fluorescence by utilising fluorescence correlation spectroscopy, which monitorsfluctuations in fluorescence intensity. From the correlation in time, we can find the res-idence time, the number of chromophores, the volume in which they are diffusing andtherefore the fluorescence emission efficiency. Fluorescence properties are a probe ofthe local environment, a particularly powerful tool due to the high brightness (quantumyield) fluorescent dyes and sensitive photo-detection equipment both of which are readilyavailable, (such as avalanche photodiodes and photomultiplier tubes). Novel materialscombining the properties of conducting and non-conducting materials at scales muchsmaller than the incident wavelength are known as meta-materials. These allow combi-nations of properties not usually possible in natural materials at optical frequencies. Theproperties reported so far include; negative refraction, negative phase velocity, fluorescenceemission enhancement, lensing and therefore light confinement has also been proposed tobe possible. Instead of expensive and slow lithography methods many of these materialsmay be fabricated with self assembly techniques, which are truly nanoscopic and otherwiseinaccessible with even the most sophisticated equipment. It was found that nanoscaled volumes from ZMW and HMMs based on NW arrays wereall inefficient at enhancing fluorescence. The primary cause was the reduced fluorescencelifetime reducing the fluorescence efficiency, which runs contrary to some commentatorsin the literature. NW based lensing was found to possible in the blue region of the opticalspectrum in a HMM, without the background fluorescence normally associated with a PAAtemplate. This was achieved using a pseudo-ordered array of relatively large nanowireswith a period just smaller than lambda / 2 which minimised losses. Nanowires in the traditionalregime lambda / 10 produced significant scattering and lead to diffraction, such that they werewholly unsuitable for an optical lensing application.
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Mota, Achiles Fontana da. "Modeling and analysis of hyperbolic metamaterials for controlling the spontaneous emission rate and efficiency of quantum emitters." Universidade de São Paulo, 2019. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-19032019-084555/.

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Анотація:
In the past few years, intensive research efforts have been devoted to studying new approaches to controlling the photon emission of quantum emitters (QEs), especially for telecommunication applications. These approaches rely on tailoring the QE\'s radiation, usually assessed via well-known figures-of-merit such as lifetime (τ) and quantum efficiency (η). Controlling the QE\'s photon emission is important because the faster its photons are emitted, the greater is the number of times it returns to the excited state per second. Therefore, it is crucial to create additional decay channels to reduce τ, which necessarily requires increasing the Purcell factor (P). One of the most promising approaches to increase P involves a new class of metamaterials, known as hyperbolic metamaterials (HMM). This class of materials exhibits pronounced anisotropy, with the parallel and perpendicular permittivity tensor elements (with respect to the anisotropy axis) presenting opposite signs, resulting in an open hyperboloidal isofrequency surface (IS). This unusual IS shape leads to the most outstanding feature of HMMs, namely, the existence of photonic modes with wavenumber (k) much larger than those in free-space (k0), known as high-k modes. By engineering these modes, it is possible to manipulate the HMM photonic density of states (PDoS), thus controlling the QE\'s radiation parameters. The simplest approach to designing HMM is by means of a planar stack of alternating thin metal and dielectric layers. However, the finite thickness of these layers induces spatial dispersion, making the extraction of effective parameters (homogenization) of these media a challenging task. In this context, we propose in this thesis a new constitutive parameter retrieval approach that takes spatial dispersion into account for all electromagnetic parameters of the medium. We demonstrate that the real part of the dispersion curve flattens out (correspondingly with a large imaginary part) because of the absence of propagating modes inside the metamaterial. This flat region is strongly dependent on the layer thicknesses and is a direct manifestation of spatial dispersion. Moreover, we demonstrate that the QE\'s lifetime calculation is overestimated if this effect is not taken into account in the homogenization procedure, which is detrimental for telecommunication applications. Moreover, we demonstrate how to enhance P by a factor greater than 100 with the use of HMMs. However, most of the QE dissipated power couples into the HMM as high-k modes (which do not propagate in free-space). Therefore, the energy is thermally dissipated inside the HMM with a consequent reduction of η . Some authors have resorted to nano-patterned HMMs (NPHM) to convert the high-k modes into free-space modes (k≤k0) aiming at increasing η. However, much of the NPHMs designs still rely on computationally costly three dimensional (3D) numerical simulations. Thus, we also propose in this thesis a new semi-analytical method to model, both in two- and three-dimensions (2D and 3D, respectively), the radiation emission of QEs interacting with nano-patterned structures. The low computational cost of this method makes it attractive for mapping P and η as function of the QE and NPHM relative position. This mapping is a helpful tool to understand the decay behavior of the whole system since QEs are arbitrarily distributed and oriented inside the NPHM. The analytically calculated decay curve allows the systems effective quantum efficiency (ηeff) and Purcell factor (Peff) to be directly obtained assuming multiple arbitrarily distributed electromagnetic sources. In this sense, we propose here a new procedure to optimize the NPHM geometrical parameters to maximize ηeff while achieving the desired Peff. We apply the proposed model to an NPHM composed of nine Ag/SiO2 layers, with the polymer host layer embedded with Rhodamine 6G, to maximize ηeff for a specified tenfold increase of Peff. This procedure allowed ηeff to be increased by 69% and 170% for one- and two-dimensional nano-patterning, respectively. Moreover, the time required to build the P and η maps (used in the calculation of the decay behavior) is reduced by approximately 96% when compared to those numerically calculated via FDTD. This procedure paves the way to the realization of new high-speed and efficient light sources for telecommunication applications.
Nos últimos anos, intensivo esforço tem sido devotado para o estudo de novas método para o controla da missão de fótons de emissores quânticos (EQs), especialmente para aplicações em telecomunicações. Estes métodos dependem da adaptação da radiação dos EQs, geralmente avaliadas por meio das bem conhecidas figuras de mérito, como o tempo de meia vida (τ) e a eficiência quântica (η). O controle da emissão de fótons é importante pois quanto mais rápido os fótons são emitidos, maior é o número de vezes que o EQ retorna ao seu estado excitado por segundo. Portanto, é crucial criar canais de decaimento adicionais para reduzir τ, o que necessariamente requer o aumento do fator de Purcell (P). Uma das abordagens mais promissoras para aumentar P envolve uma nova classe de metamateriais, conhecida como metamateriais hiperbólicos (MHs). Esta classe de materiais apresenta pronunciada anisotropia, onde os elementos paralelo e perpendicular do tensor de permissividade (em relação ao eixo de anisotropia) apresentam sinais opostos, resultando em uma superfície de isofrequência (SI) hiperboloidal aberta (IS). Essa forma incomum de SI leva à característica mais marcante dos MHs, a existência de modos fotônicos com número de onda (k) muito maior do que aqueles no espaço livre (k0), conhecidos como modos alto-k. Ao manipular esses modos, é possível manipular a densidade de estados fotônicos (DES) dos MHs, controlando assim os parâmetros de radiação do QE. A abordagem mais simples para a criação de MHs é por meio de uma pilha plana de camadas metálicas e dielétricas alternadas. Entretanto, a espessura finita dessas camadas induz a dispersão espacial, tornando a extração de parâmetros efetivos (homogeneização) destes meios uma tarefa desafiadora. Neste contexto, propomos nesta tese uma nova abordagem de recuperação de parâmetros constitutivos a dispersão espacial de todos os parâmetros eletromagnéticos do meio é levada em consideração. Nós demonstramos que a parte real da curva de dispersão se aplaina (correspondentemente com uma grande parte imaginária) devido à ausência de modos propagantes dentro do metamaterial. Esta região plana é fortemente dependente das espessuras das camadas e é uma manifestação direta da dispersão espacial Além disso, nós mostramos que se a dispersão espacial não for corretamente considerada no processo de homogeneização, o tempo de meia vida do EQ pode ser superestimado, o que é prejudicial para aplicações de telecomunicações. Além disso, demonstramos como melhorar P por um fator maior que 100 com o uso de MHs. a maior parte da potência dissipada pelos EQs são acopladas nos MHs como modos de alto-k (que não se propagam no espaço livre). Portanto, a energia é dissipada termicamente no interior do MH, resultando em uma redução de η. Alguns autores recorreram a MHs nano-estruturados (MHNE) para converter os modos alto-k em modos de espaço livre (k≤k0) visando o aumento de η. No entanto, muitos dos projetos do NPHM ainda dependem de simulações numéricas tridimensionais (3D) computacionalmente dispendiosas. Assim, também propomos nesta tese um novo método semi-analítico para modelar, tanto em duas como em três dimensões (2D e 3D, respectivamente), a emissão de radiação de EQs interagindo com estruturas nano-estruturadas. O baixo custo computacional deste método faz com que seja atrativo para o mapeamento de P e η em função da posição relativa do EQ e do MHNE. Esse mapeamento é uma ferramenta útil para entender o comportamento de decaimento de todo o sistema, já que os EQs são arbitrariamente distribuídos e orientados dentro do MHNE. A curva de decaimento calculada analiticamente permite que a eficiência quântica efetiva do sistema (ηeff) e o fator de Purcell (Peff) sejam obtidos diretamente, assumindo múltiplas fontes eletromagnéticas arbitrariamente distribuídas. Neste sentido, propomos aqui um novo procedimento para otimizar os parâmetros geométricos do MHNE visando a maximização de ηeff enquanto Peff é aumentado à um valor desejado. Aplicamos o modelo proposto a um MHNE composto por nove camadas de Ag/SiO2, com a camada de polímero embutida com Rodamina 6G, visando maximizar ηeff para um aumento de dez vezes de Peff. Este procedimento permitiu que o ηeff fosse incrementado em 69% e 170% para nano-estruturas uni e bidimensionais, respectivamente. Além disso, o tempo necessário para construir os mapas P e η (utilizados no cálculo da curva de decaimento) é reduzido em aproximadamente 96% quando comparado com os calculados numericamente via FDTD. Este procedimento abre caminho para o desenvolvimento de novas fontes de luz de alta velocidade e eficiência para aplicações de telecomunicações.
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8

Omeis, Fatima. "Theorical and experimental study of plasmonic metamaterials for infrared application." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC041/document.

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Анотація:
Le contrôle des ondes électromagnétiques joue un rôle fondamental dans les technologies photoniques actuelles. De nos jours, on assiste à une demande croissante de composants agiles capable d'absorber efficacement les ondes électromagnétiques dans divers gamme de fréquences. Habituellement, ces absorbeurs s'appuient sur les résonances plasmoniques qui apparaissent dans les métaux nobles dans la gamme visible. Cependant, l'extension des propriétés plasmoniques aux spectres infrarouge et THz nécessite des matériaux adéquats ayant un comportement métallique à ces fréquences. Dans ce travail, nous étudions numériquement et expérimentalement les structures métal-isolant-métal (MIM) réalisées à partir de semi-conducteur hautement dopé Si: InAsSb qui a un comportement métallique dans la gamme infrarouge. Dans la deuxième partie, nous avons amélioré l'efficacité des résonateurs MIM en utilisant des métamatériaux hyperboliques qui miniaturisent les résonateurs. Dans la dernière partie, nous proposons un design universel ultra-mince qui permet de dépasser les contraintes associées au choix des matériaux et permettant la réalisation d'un absorbeur fonctionnant sur une gamme spectrale allant de l'infrarouge aux micro-onde
The control of light absorbance plays a fundamental role in today's photonic technologies. And the urge to design and develop flexible structures that can absorb electromagnetic waves is very growing these days. Usually, these absorbers relies on plasmonic resonances that arise in noble metals in the visible range. However, the extension of the plasmonic properties to the infrared and THz spectra requires adequate materials that have a metallic behavior at these frequencies. In this work, we study numerically and experimentally the metal-insulator-metal (MIM) structures realized from highly doped semiconductor Si:InAsSb that has a metallic behavior in the infrared range. In the second, part we improved the efficiency of the MIM resonators by using hyperbolic metamaterials that also miniaturize the resonators. In the last part, we propose an ultra-thin universal design that overcomes the material barrier so that the total absorption can be achieved for different spectral ranges without changing the material
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9

Peillon, Etienne. "Simulation and analysis of sign-changing Maxwell’s equations in cold plasma." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAE004.

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Анотація:
De nos jours, les plasmas sont principalement utilisés à des fins industrielles. L'un des exemples les plus fréquemment cités d'utilisation industrielle est la production d'énergie électrique via des réacteurs nucléaires à fusion. Pour contenir le plasma correctement à l'intérieur du réacteur, un champ magnétique est imposé en arrière-plan, et la densité et la température du plasma doivent être précisément contrôlées. Cela est effectué en envoyant des ondes électromagnétiques à des fréquences et dans des directions spécifiques en fonction des caractéristiques du plasma.La première partie de cette thèse de doctorat est consacrée à l'étude du modèle du plasma avec un fort champ magnétique en arrière-plan, ce qui correspond à un métamatériau hyperbolique. L'objectif est d'étendre les résultats existant en 2D au cas 3D et de dériver une condition de radiation. Nous introduisons une séparation des champs électriques et magnétiques ressemblant à la décomposition TE et TM habituelle, puis nous présentons quelques résultats sur les deux problèmes résultants. Les résultats sont dans un état très partiel et constituent un brouillon approximatif sur le sujet.La deuxième partie étudie l'EDP dégénérée associée aux ondes résonantes « lower-hybrid » dans le plasma. Le problème aux limites associé est bien posé dans un cadre variationnel « naturel ». Cependant, ce cadre n'inclut pas le comportement singulier présenté par les solutions physiques obtenues via le principe d'absorption limite. Ce comportement singulier est important du point de vue physique car il induit le chauffage du plasma mentionné précédemment. Un des résultats clés de cette deuxième partie est la définition d'une notion de saut à travers l'interface à l'intérieur du domaine, ce qui permet de caractériser la décomposition de la solution d'absorption limite en parties régulière et singulière
Nowadays, plasmas are mainly used for industrial purpose. One of the most frequently cited examples of industrial use is electric energy production via fusion nuclear reactors. Then, in order to contain plasma properly inside the reactor, a background magnetic field is imposed, and the density and temperature of the plasma must be precisely controlled. This is done by sending electromagnetic waves at specific frequencies and directions depending on the characteristics of the plasma.The first part of this PhD thesis consists in the study of the model of plasma in a strong background magnetic field, which corresponds to a hyperbolic metamaterial. The objective is to extend the existing results in 2D to the 3D-case and to derive a radiation condition. We introduce a splitting of the electric and magnetic fields resembling the usual TE and TM decomposition, then, it gives some results on the two resulting problems. The results are in a very partial state, and constitute a rough draft on the subject.The second part consists in the study of the degenerate PDE associated to the lower-hybrid resonant waves in plasma. The associated boundary-value problem is well-posed within a ``natural'' variational framework. However, this framework does not include the singular behavior presented by the physical solutions obtained via the limiting absorption principle. Notice that this singular behavior is important from the physical point of view since it induces the plasma heating mentioned before. One of the key results of this second part is the definition of a notion of weak jump through the interface inside the domain, which allows to characterize the decomposition of the limiting absorption solution into a regular and a singular parts
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10

Ju, Nyan-Ping, and 朱念平. "Straight-sidewall cavity broadband hyperbolic metamaterial perfect absorber." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/55dyb6.

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Анотація:
碩士
國立交通大學
電子工程學系 電子研究所
104
A new structure for a nearly-perfect hyperbolic meta-material(HMM) absorber is proposed, and initial experimental verification is provided. To date, HMM PMAs are realized using tapered stacks that can provide adiabatic waveguiding over a wide spectral range. Nevertheless, the tapered nature can prevent its usage for large-area applications such as the emitters in thermophotovoltaics (TPV). The design proposed here has decent wavelength scalability and can be used from optical black holes to microwave perfect absorbers. The physics behind the HMM straight-sidewall cavity is the broadband highly confined resonance. While, in most of the cases, the broadband quasi-guided modes are weekly confined in nature, the HMM cavity can provide broadband resonances but still maintain reasonably strong oscillation strength for high absorption. This is because the photonic density of state (PDOS) is boosted dramatically by the hyperbolic dispersion of the straight-sidewall Al/SiO2 stacks.
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Книги з теми "Hyperbolic metamaterial"

1

Moradi, Afshin. Theory of Electrostatic Waves in Hyperbolic Metamaterials. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-48596-1.

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2

Smolyaninov, Igor I. Hyperbolic Metamaterials. IOP Concise Physics, 2018.

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Smolyaninov, Igor I. Hyperbolic Metamaterials. Morgan & Claypool Publishers, 2018.

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Smolyaninov, Igor I. Hyperbolic Metamaterials. IOP Concise Physics, 2018.

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Theory of Electrostatic Waves in Hyperbolic Metamaterials. Springer, 2023.

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Частини книг з теми "Hyperbolic metamaterial"

1

Vaianella, F., and B. Maes. "Fano Resonances in Slanted Hyperbolic Metamaterial Cavities." In Springer Series in Optical Sciences, 383–402. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99731-5_16.

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2

K. V., Sreekanth, Mohamed ElKabbash, Vincenzo Caligiuri, Ranjan Singh, Antonio De Luca, and Giuseppe Strangi. "Guided Modes of Hyperbolic Metamaterial and Their Applications." In Progress in Optical Science and Photonics, 129–58. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8891-0_8.

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3

Strangi, G., K. V. Sreekanth, and M. Elkabbash. "Hyperbolic Metamaterial-Based Ultrasensitive Plasmonic Biosensors for Early-Stage Cancer Detection." In Next Generation Point-of-care Biomedical Sensors Technologies for Cancer Diagnosis, 155–72. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4726-8_7.

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4

Moradi, Afshin. "Hyperbolic Metamaterials." In Theory of Electrostatic Waves in Hyperbolic Metamaterials, 1–37. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-48596-1_1.

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5

Sreekanth, Kandammathe Valiyaveedu, and Ranjan Singh. "Active Hyperbolic Metamaterials and Their Applications: From Visible to Terahertz Frequencies." In Metamaterials, 199–226. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003050162-8.

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6

K. V., Sreekanth, Mohamed ElKabbash, Vincenzo Caligiuri, Ranjan Singh, Antonio De Luca, and Giuseppe Strangi. "Dielectric Singularities in Hyperbolic Metamaterials." In Progress in Optical Science and Photonics, 81–101. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8891-0_5.

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7

Lavrinenko, Andrei V., and Radu Malureanu. "Fabrication and Characterization of Hyperbolic Metamaterials." In Metamaterials Science and Technology, 1–21. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-13-0261-9_46-1.

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8

K. V., Sreekanth, Mohamed ElKabbash, Vincenzo Caligiuri, Ranjan Singh, Antonio De Luca, and Giuseppe Strangi. "Resonant Gain Singularities in Hyperbolic Metamaterials." In Progress in Optical Science and Photonics, 103–15. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8891-0_6.

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9

Moradi, Afshin. "Electrostatic Waves in Hyperbolic Metasurfaces." In Theory of Electrostatic Waves in Hyperbolic Metamaterials, 213–26. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-48596-1_10.

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10

Vasilantonakis, Nikolaos, Gregory A. Wurtz, and Anatoly V. Zayats. "Refractive Index Sensing with Anisotropic Hyperbolic Metamaterials." In Biomedical Optical Sensors, 81–107. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48387-6_4.

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Тези доповідей конференцій з теми "Hyperbolic metamaterial"

1

Othman, Mohamed A. K., Caner Guclu, and Filippo Capolino. "Graphene-based hyperbolic metamaterial." In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6710903.

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2

Li, K., E. Simmons, A. Briggs, J. Xu, Y. Cheng, Ray T. Chen, S. Bank, V. A. Podolskiy, and D. Wasserman. "Hyperbolic Metamaterial Photonic Funnels." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleo_qels.2020.fm1b.4.

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3

Bhardwaj, Abhinav, Kumar Vaibhav Srivastava, and S. Anantha Ramakrishna. "Hyperbolic Metamaterial Near-field Coupler." In 2019 IEEE Asia-Pacific Microwave Conference (APMC). IEEE, 2019. http://dx.doi.org/10.1109/apmc46564.2019.9038182.

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Prayakarao, S., B. Mendoza, A. Devine, C. Kyaw, R. B. Van Dover, and M. A. Noginov. "Tunable VO2/Au hyperbolic metamaterial." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_at.2015.jtu5a.105.

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Noginov, M. A., Yu A. Barnakov, G. Zhu, T. Tumkur, H. Li, and E. E. Narimanov. "Bulk Metamaterial with Hyperbolic Dispersion." In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/cleo.2009.jwc2.

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6

Jen, Yi-Jun, and Teh-Li Chan. "Iso-frequency curve of a stratiform hyperbolic metamaterial composed of symmetrical film stack." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/oic.2022.md.11.

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Анотація:
The iso-frequency curves of a stratiform hyperbolic metamaterial were calculated with effective medium approximation and model of symmetrical film stack. The curves were compared for a hyperbolic metamaterial at different metal fill-fractions.
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7

Krishnamoorthy, Harish N. S., Behrad Gholipour, Nikolay I. Zheludev, and Cesare Soci. "Reconfigurable hyperbolic metamaterial with negative refraction." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/cleo_si.2016.sw4r.3.

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8

Hu, Haifeng, Dengxing Ji, Xie Zeng, Kai Liu, and Qiaoqing Gan. "Rainbow Trapping in Hyperbolic Metamaterial Waveguide." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/cleo_qels.2013.qtu2a.4.

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9

Feng, Kaijun, Deborah Sivco, and Anthony J. Hoffman. "Nanoscale Hyperbolic Metamaterial Resonators in Semiconductors." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/cleo_qels.2016.fth4d.2.

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10

Liu, Fang, and Yidong Huang. "Threshold-less Cherenkov radiation in hyperbolic metamaterial." In Smart Photonic and Optoelectronic Integrated Circuits XX, edited by El-Hang Lee and Sailing He. SPIE, 2018. http://dx.doi.org/10.1117/12.2293363.

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Звіти організацій з теми "Hyperbolic metamaterial"

1

Noginov, M. A., H. Li, D. Dryden, G. Nataraj, Yu A. Barnakov, G. Zhu, M. Mayy, Z. Jacob, and E. E. Narimanov. Experimental Probing of Photonic Density of States in Hyperbolic Metamaterial. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada523097.

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